CHRISTINA AGUILERA

"Happy 1st Day of Summer!" wrote the singer after posting a sweet selfie on Twitter of her growing bump. Already mom to Max, 6, Aguilera proves she's got this mom-to-be thing down. "I'm really excited to meet our baby girl. This has been a very easy and enjoyable pregnancy," she told PEOPLE.

VANESSA CARLTON

The "A Thousand Miles" singer, who married last fall, has a new project in the works – a baby. And she announced her exciting news with a sweet photo of her baby bump. "No, those aren't a bunch of croissants. We're expecting a baby. It's healthy and moving around like a champ," Carlton wrote.

STACY KEIBLER

The actress and TV host hasn't welcomed her little girl yet, but she's already excited about celebrating. "Can't wait to spend next #MothersDay with this little angel in my arms," Keibler captioned an Instagram photo of her growing belly.

ALYSSA MILANO

Just two weeks after announcing her second pregnancy, the actress shared a photo of her growing bump on Instagram. "The bump ... #shortpeoplecarrybig #noitsnottwins," she wrote, explaining the size of her belly.

OLIVIA WILDE

"Sure I've looked like this after Mexican food but this time it's a BABY," joked the expectant actress on Instagram after posting this fun pic of her growing belly. As for Wilde's due date, it looks like it's coming up soon. She added the hashtags: "#almostcooked" and #nineweekstogo" to the caption.

GWEN STEFANI

After belly bumping with now new mom Rachel Zoe last October, the singer decided to give fans a solo shot of her growing curves on Twitter. But this wasn't her only pregnancy reveal on social media. Stefani also announced she's having another boy on her new Instagram account.

GWEN STEFANI & RACHEL ZOE

Some stars fist bump, but Gwen Stefani and Rachel Zoe took it to another level with a belly bump. Stefani, who has remained mum on her pregnancy, joined her fashionable gal pal (who's expecting baby No. 2) in a "#majormommymoment" at an Oct. 23 gala in Beverly Hills. "Another fun one from moms night out at #wallisannenberg! Isn't @gwenstefani the most gorgeous?" Zoe shared on Instagram.

HILARIA BALDWIN

Awaiting the arrival of her baby girl with doting hubby Alec, the yoga instructor shared how her new body is adjusting to workout gear. "Pitufina's getting big! Thank god I'm a yoga teacher … Same clothes, WAY different fit!" she revealed on Instagram.

AUTUMN REESER

When announcing her baby news, Reeser got the timing down to a tee. "It's Pregnancy Awareness Month, so you should be aware … that I'm pregnant! Yup. Baby number TWO is on the way and due at the end of November. We’re thrilled!" the actress – who delivered son Dashiell on Nov. 25 and is already mom to 2-year-old son Finn – wrote alongside a pair of photos showing off her growing belly.

JAMIE LYNN SIGLER

Did he feel a kick? While catching up on a little RampR, the actress's adorable pup kept close to her burgeoning bump. "Brotherly love. Bean is patiently waiting," Sigler – who is expecting her first child with fiancé Cutter Dykstra – shared on Instagram.

MALIN AKERMAN

The Children's Hospital actress – who welcomed son Sebastian on April 16 – hit a high note, thanks to a little help from David Bowie. "What do y'all think of my #Grammy look? Bowie w a baby bump ;)" she Tweeted during this year's Grammy telecast.

SHAKIRA

Looks like the former Voicementor truly enjoyed the lead-up to motherhood: "Podréa estar 9 meses més asé! I could have another 9 months like this," she captioned a photo of herself and beau Gerard Piqué as they happily looked forward to the Jan. 22 arrival of son Milan.

JENNIE FINCH

Let the countdown begin! Weeks prior to daughter Paisley Faith's birth on Jan. 12, the former softball player captured life at home with her busy brood. "Waiting amp rejoicing on the arrival of our sweet baby girl! #BellyBump 10 days to due date!" Finch announced on Instagram.

CACEE COBB

Taking a page out of BFF Jessica Simpson's playbook, the newlywed – who tied the knot with actor Donald Faison in December 2012 – caught up on "Sun amp Laughter," putting her expanding tummy front and center while basking in the beautiful weather.

KIM KARDASHIAN

It was nothing but "baby love" for the reality star, who didn't hesitate to share her road to motherhood with fans – including a few snapshots of her bare bump. And the nine months was certainly worth the wait: Kardashian and beau Kanye West welcomed daughter North West on June 15.